My client website working ok on all devices but having problem with Iphone.
I tried to debug website for iPhone with google chrome inspect element mobile tool, but i
I've been using WebIDE. It's a Firefox add-on that enables you to connect the Firefox Developer Tools to a number of other browsers, including Firefox for Android, Chrome on Android, and Safari on iOS. You'll need Firefox 37+ or the developer edition. You can find instructions here (MDN) and here (More to the point)
Note: It's not working (at least for me) with the latests version of iOS (it did work with iOS 8). It does connect, but it doesn't see the pages you are navigating in your device.
You can use Web Inspector Tool in Safari.
If Develop menu is not available you can enable it from Preferences -> Advance and check Show Develop menu.